Cod sursa(job #1462151)

Utilizator tudorgalatanRoman Tudor tudorgalatan Data 17 iulie 2015 11:24:22
Problema Ciurul lui Eratosthenes Scor 50
Compilator cpp Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include <fstream>

using namespace std;

bool c[2000001];
long  n, i, j, nr;

int main()
{
    ifstream f("ciur.in");
    ofstream g("ciur.out");
    f >> n;
    for(i=2; i<=n; i++)
    {
        if (c[i] == 0)
            nr++;
        for(j=i+i; j<=n; j=j+i)
            c[j] = 1;
    }
    g << nr;
    return 0;
}